UFO Robot Grendizer

The story follows Duke Fleed, a survivor from the planet Vega, who was taken in and raised by Dr. Umon on Earth under the name Daisuke Umon. Years later, he finds himself confronting King Vega and his forces as they plot to invade Earth. With the help of his friends Koji and Hikaru-and later his younger sister, Maria Grace-Duke takes a stand against the invaders, relying on his greatest weapon: the powerful Grendizer.